Rings, restraints and resolving the superbowl in CRYSTALS
A.J. Edwards · Acta Crystallographica Section A Foundations of Crystallography · 2005
Analysis of polymorphic systems shows that extended patterns are conserved between polymorphic forms for 75% of cases studied.a) b) Figure 1.a) An 'R4 sheet' motif.b) An R2R6 sheet motif.Dots represent molecules, lines represent inter-molecular hydrogen bonds.The arrows indicate that these patterns are infinitely repeating in 2D.